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Furnace heats house then blows cold air
I have a Lennox duraglass GII furnace. I have had some problems recently with the unit not opening the gas valve. I replaces the t-couple and it fixed the gas valve problem. However, now the unit will turn on and heat my house but the fan will continue to run after the house is above the set temp and blow cold air. I've reset my theromstat and reviewed similar questions with no luck. Any suggestions?
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